购物车
使用ASP.NET写一个购物车怎么写？
[解决办法]
可以用Cookie
或者Session存储
其实就是存储 产品ID 数量
using System;using System.Collections.Generic;using System.Web;using System.Data;using river.Data;namespace river{ public class cs_cart_cookie { public static char Sp = '|'; public static HttpCookie getCartCookie() { //往购物车中添加商品 HttpCookie hc = null; HttpRequest Request = HttpContext.Current.Request; if (Request.Cookies["ShoppingCart"] == null) { //如果Cookies中不存在ShoppingCart，则创建 hc = new HttpCookie("ShoppingCart"); } else { //如果Cookies中存在ShoppingCart，则取出 hc = Request.Cookies["ShoppingCart"]; } return hc; } public static int getCartItemCount() { int count = 0; HttpCookie hc = getCartCookie(); List<ShoppingCart> list = new List<ShoppingCart>(); //循环从购物车中取出物品添加到集合 foreach (string item in hc.Values) { if (item != null) { count += int.Parse(hc[item].Split(Sp)[1]); } } return count; } public static List<ShoppingCart> getCartList() { HttpCookie hc = getCartCookie(); List<ShoppingCart> list = new List<ShoppingCart>(); //循环从购物车中取出物品添加到集合 foreach (string item in hc.Values) { if (item != null) { try { string[] w = hc[item].Split(Sp); ShoppingCart gwc = new ShoppingCart(); DataRow dr = DB.getDr("select price,title,number,picture from products where id=" + int.Parse(w[0])); if (dr != null) { gwc.ProductID = int.Parse(w[0]); gwc.Qty = int.Parse(w[1]); gwc.Size = w[2]; gwc.Color = w[3]; gwc.ProductName = Convert.ToString(dr["title"]); gwc.ProductNumber = Convert.ToString(dr["number"]); gwc.Price = Convert.ToDecimal(dr["price"]); gwc.ProductPicture = Convert.ToString(dr["picture"]); list.Add(gwc); } } catch { } } } list.Sort(); return list; } public static void AddToCart(int productID,int qty,string Size,string color) { HttpCookie hc = getCartCookie(); bool flag = true;//标记在购物车中是否存在本次选择的物品 //在购物车的Cookies中查找是否存在这次要选择的物品 foreach (string item in hc.Values) { if (item == productID.ToString()) { flag = false; break; } } color = HttpUtility.UrlEncode(color); if (flag) { //如果选择的内容在购物车中没有，则创建一个新的子键 hc.Values.Add(productID.ToString(), productID.ToString() + "|" + qty + "|" + Size + "|"+color); } else { //如果选择的内容在购物车中没，则删除原来的，添加一个新的 int num = int.Parse(hc.Values[productID.ToString()].Split(Sp)[1]) + qty; hc.Values.Remove(productID.ToString()); hc.Values.Add(productID.ToString(), productID + "|" + num.ToString() + "|" + Size + "|" + color); } hc.Expires = DateTime.Now.AddDays(30); HttpContext.Current.Response.Cookies.Add(hc); } public static void UpdateCart(int productID, int qty) { HttpCookie hc = getCartCookie(); bool flag = true; string Size=""; string color=""; foreach (string item in hc.Values) { if (item == productID.ToString()) { string[] w = hc[item].Split(Sp); Size = w[2]; color = w[3]; flag = false; break; } } if (!flag) { //如果选择的内容在购物车中没，则删除原来的，添加一个新的 hc.Values.Remove(productID.ToString()); hc.Values.Add(productID.ToString(), productID + "|" +qty+ "|" + Size + "|" +color); } hc.Expires = DateTime.Now.AddDays(30); HttpContext.Current.Response.Cookies.Add(hc); } public static void DelCart(int productID) { HttpCookie hc = getCartCookie(); hc.Values.Remove(productID.ToString()); hc.Expires = DateTime.Now.AddDays(30); HttpContext.Current.Response.Cookies.Add(hc); } } public class ShoppingCart:IComparable { public ShoppingCart() { } int productid; public int ProductID { get { return productid; } set { productid = value; } } int qty; public int Qty { get { return qty; } set { qty = value; } } string size; public string Size { get { return size; } set { size = value; } } string color; public string Color { get { return color; } set { color = HttpUtility.UrlDecode(value); } } string productname; public string ProductName { get { return productname; } set { productname = value; } } decimal price; public decimal Price { get { return price; } set { price = value; } } string number; public string ProductNumber { get { return number; } set { number = value; } } string picture; public string ProductPicture { get { return picture; } set { picture = value; } } public decimal SubTotal { get { return price * qty; } } public int CompareTo(object obj) { int productID = ((ShoppingCart)obj).ProductID; return this.ProductID.CompareTo(productID); } }}